Is GLM 4.5 Air or GPT-5.1-Codex cheaper?

GLM 4.5 Air is cheaper on output tokens ($0.56 vs $10.00 per 1M).

Which has the larger context window, GLM 4.5 Air or GPT-5.1-Codex?

GPT-5.1-Codex has the larger context window (400K tokens).

GLM 4.5 Air vs GPT-5.1-Codex

GLM 4.5 Air is cheaper on output tokens, while GPT-5.1-Codex offers a larger context window. Choose GLM 4.5 Air or GPT-5.1-Codex based on the trade-off between cost, context, and the benchmarks that matter for your use case.

Spec	GLM 4.5 Air	GPT-5.1-Codex
Provider	ZenMux	ZenMux
Input / 1M tokens	$0.11	$1.25
Output / 1M tokens	$0.56	$10.00
Context window	128K	400K
Parameters	—	—
Open weights	No	No
Released	Jul 2025	Nov 2025

GLM 4.5 Air details →GPT-5.1-Codex details →

FAQ

Pricing is indicative — confirm with the provider before production use. Highlighted values indicate the better figure for that row.